I have been trying to use Save-as PDF from the File menu in FrameMaker 2019 but the File\Publish settings seem to be overriding the folder selection I make in Save-as PDF. My PDF are being saved to a different folder that I set up during Save-as. I am creating PDFs for a number of different .book files want each one saved into the folder that contains the l.fm and .book file. I never had this issue with Previous version of FrameMaker.
This was a "feature" of the new Publishing pod. As of update 2 for Frame 2019, the option to save to a selected directory the way it used to work is back in the Save As PDF. It may be possible to set it for publishing, also, but someone else will have to provide that information as I have not worked with the publishing feature.